An Account of the Middle Silurian Rocks of Ohio and Indiana. 



197 



however, along the creek, the weathered Laurel formation is more 

 shaly and thin bedded below. The Clinton here has a thickness of 

 35 inches. It is in large part brownish in color, like the Clinton at 

 Hanover. Immediately below is a bluish white limestone, as white as 

 the Laurel formation rock, but containing Strophometia alternata. 

 Below, this white rock changes to more blue, and its total thickness is 

 10 inches. It is underlaid by 12 inches of blue shale, and this in turn 

 by alternating layers of blue clayey shale and limestone. 



40. Rofing and Wagner's School House. — Three and a half miles 

 north of Napoleon, on the road from New Point to Napoleon. In 

 the Creek bed the Clinton is exposed. It is about a foot thick, and 

 has the brownish color seen at Hanover, Indiana. The following 

 fossils were found : Cyclonema Mix, ordinary Clinton type, Ortliis 

 caUigramma \ var. citort/u's, P/uenopora expansa, Pachydictya bifurcata, 

 Clathropora frondosa, and Hcliolitcs megasioma ? Below the Clinton was 

 found rock varying in color from bluish like the Cincinnati group, 

 rock, to white, similar to that seen at the New Point quarry, and said 

 to resemble the Dayton stone lithologically but not stratigraphically. 

 Above the Clinton were found two feet of a whitish rock. This rock 

 was in places crinoidal, and at other places more nearly resembled the 

 texture of the Dayton stone. The weathered surfaces of the rock 

 usually showed plenty of crinoidal material. A large pygidium of 

 IUamus daytoncnsis was found in it but this fossil belongs also in the 

 higher horizons. The thin yellowish layers of the magnesian Niagara, 

 such as are seen often near the base of the Laurel bed, were found 

 immediately above. For purposes of correlation this locality should 

 be more carefully investigated. 



41. Napoleon. — Along the side of a little stream near the house 

 of David L. Eaton, about one and a half miles north of Napoleon, rock 

 is exposed. One layer is crinoidal, whitish, and hard, is 8 inches 

 thick and resembles the crinoidal layer in the creek south of the 

 Rofing and Wagner school-house. In this rock was found a small 

 glabella of IUamus ambiguus, but this form is probably identical or at 

 least an immediate forerunner of IUamus insignis, in the Niagara; it 

 requires the pygidium to distinguish the species. This rock appears 

 to be the same also as the basal portion of the Laurel bed as exposed 

 in the quarry at the north end of Osgood, where it is also richly 

 crinoidal but carries an undoubted Niagara fauna. If this be the 



